Php/docs/arrayobject.uksort
ArrayObject::uksort
(PHP 5 >= 5.2.0, PHP 7)
ArrayObject::uksort — Sort the entries by keys using a user-defined comparison function
Description
public ArrayObject::uksort
( callable $cmp_function
) : void
This function sorts the keys of the entries using a user-supplied comparison function. The key to entry correlations will be maintained.
Parameters
cmp_functionThe callback comparison function.
Function
cmp_functionshould accept two parameters which will be filled by pairs of entry keys. The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
Return Values
No value is returned.
Examples
Example #1 ArrayObject::uksort() example
<?phpfunction cmp($a, $b) { $a = preg_replace('@^(a|an|the) @', , $a); $b = preg_replace('@^(a|an|the) @', , $b); return strcasecmp($a, $b);}$array = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);$arrayObject = new ArrayObject($array);$arrayObject->uksort('cmp');foreach ($arrayObject as $key => $value) { echo "$key: $value\n";}?>
The above example will output:
an apple: 3 a banana: 4 the Earth: 2 John: 1
See Also
- ArrayObject::asort() - Sort the entries by value
- ArrayObject::ksort() - Sort the entries by key
- ArrayObject::natsort() - Sort entries using a "natural order" algorithm
- ArrayObject::natcasesort() - Sort an array using a case insensitive "natural order" algorithm
- ArrayObject::uasort() - Sort the entries with a user-defined comparison function and maintain key association
